A sexual favor commonly performed by a man on a woman where the man uses his nose to repeatedly jab the woman's fartbox or anus. Only the nose may be used for a properly executed Brown Robin

Justin : '' So im down on one knee about to propose...and she's not havin it...
Matt: '' uh oh, what' d you do then?

Justin: '' well, I spun her around and gave her the old Brown Robin!!!
Or
Nick: '' Last night the wife let me bust a nut all over her time wasting face...''
Ryan: No Shit! How'd you get her to do that?
Nick: '' welp, I warmed her up real good with the old Brown Robin!!!